Percussive type wood chisel



July 5, 1949. J, -r50 2,475,041

PBBOUSSIVE TYPE WOOD CHISEL Filed Feb. 25, 1946 IIIIII llllll/ l a p 4 vINVENTOR JOSEPH MMATTSON AT TORNEYS Patented July 5, 1949 UNITEDJ'SETATLE'S' pr ce.

2,475,04l PERCUSSIVE TYPEWOUD CHISEL Joseph MQMattson, Kenosha, Wis.Application February 25, 1946;Sefibllfio. 349,915 1 Claim. (Cl. 14524)My invention refers to hammer tools of the type wherein a weightedhandle is reciprocated upon a stem to impart blows to a tool carried bythe stem.

The object of my invention is to provide for strength and lightness inweight, a hollow stem having a bottom shouldered socket for receiving aremovable tool and a chuck mechanism for strengthening the socket,whereby heavy blows upon the chuck mechanism will be absorbed andtransmitted to a tool mounted in the socket.

The hammer tool is particularly adapted for special inter-changeabletools such as: Ripping chisel, wood chisel, center punch, star drill,leather punch, plumbers caulking iron (inside and outside), caulkingtool for cracks, chipping chisel, nail set, ice pick, etc.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the novel construction,combination and arrangement of parts, substantially as hereinafterdescribed, and more particularly defined by the appended claim, it beingunderstood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claim.

In the accompanying drawings is illustrated one complete example of thephysical embodiment of the present invention constructed according tothe best mode so far devised for the practical application of theprinciples thereof.

In the drawings:

Fig. 1 represents a side elevation of a hammer tool embodying thefeatures of my invention, with parts broken away and other parts insection to more clearly illustrate structural features; and

Fig. 2 is a side elevation of a center punch tool forming one of aseries of such tools.

Referring by characters to the drawings, I represents a hollow stem ofany desired length.

The lower receiving tool end of the stem is counterbored to form asocket terminating with a shoulder '2 adapted to receive the shank 3 ofa removable tool, which tool, as shown in Fig. 1, is of the chisel type.The tool, intermediate its ends, is provided with a shoulder 4 fromwhich the shank 3 extends.

The end portion of the stem is exteriorly threaded for the reception ofan internally annular threaded sleeve 5 and said sleeve terminated, atits lower end, with an inturned flange 5, which flange abuts the end ofthe stem. Thus it will be noted, a chuck for the tool is developedwhichwill eifectively reinforce the socket against hammer blows and preventspringing or bulging of the parts. Furthermore, in the event that theanvil sleeve is broken or marred in use, the same can be quicklyrenewed.

After the anvil sleeve is properly positioned, the same, together withthe stem end, is transversely apertured and threaded for the receptionof a thumb screw 6.

The shank 3 of the tool, is formed with an annular channel I above theshoulder 4 and in alignment with the thumb screw, whereby the end ofsaid thumb screw, when positioned, will impinge against the bottom ofthe channel and thus hold a tool securely in place.

Furthermore, the thumb screw, in addition to holding the tool in theproper position, will also confine the sleeve, with reference to thestem, whereby jarring of the parts will prevent loosening of the screwthreaded connection between said stem and anvil sleeve, it beingunderstood that the shock of the blows upon the tool will be absorbed bythe shoulder 4 of the same engaging the sleeve flange 5, and also theshoulder connection 2 between the end of the shank and stem.

To complete the tool, a hollow weighted handle I is reciprooativelymounted upon the stem and thereafter it is confined by a cap I" inthreaded union with the upper end of said stem.

Fig. 2 simply illustrates one of the various tools that may be fittedinto the chuck and while I have previously mentioned a number of suchtools applicable to the machine, it is understood that they may bevaried indefinitely, as, for example, it is possible to use :a tool ofthe fork variety for gardening purposes wherein it is desired to loosenup hard soil about plants.

I claim:

A hammer tool comprising a hollow stem open on one end and having ashoulder therein intermediate the ends of the stem and facing said openend, a portion of the stem adjacent the open end being externallythreaded, a sleeve in threaded union with the threaded portion of thestem, the sleeve being provided on one end with an intumed flangeengaging said one end of said stem and on the other end with an anvilsurface, a percussive tool having a shank of reduced diameter to form ashoulder, said shank being removably positioned within the open end ofthe stem and with the shoulder of the shank engaging the sleeve flangeand the free end of said shank engaging the stem shoulder, when the toolis in its operative position, said shank having an annular groove formedtherein and intermediate the shoulder and the free end of the shank, athreaded aperture extending through the sleeve and stem and in alignmentwith the shank groove when the tool is in its operative position in thestem, a thumb screw in threaded union with the sleeve and stem apertureand engaging the bottom of the shank groove, whereby the three elementsare held against relative rotation incidental to vibration, a capsecured to theupper end of the aforesaid stem, and a weighted handlereciprocatively mounted upon said stem between the cap and sleeve, theend of the handle nearest the sleeve being provided. witha strikingsurface to impinge said anvil surface whereby i to impart a hammer blowto the tool.

JOSEPH M. MATTSON.

REFERENCES CITED The following referenlces are of record in the file ofthis patent:

UNITED STATES PATENTS

